#if defined(GB_SYSTEM_FREEBSD) || defined(GB_SYSTEM_OPENBSD)
#include <sys/types.h>
#include <sys/sysctl.h>
#endif
#include "build_cpuid.cpp"

// #if defined(GB_SYSTEM_WINDOWS)
// #define DEFAULT_TO_THREADED_CHECKER
// #endif

#define DEFAULT_MAX_ERROR_COLLECTOR_COUNT (36)

enum TargetOsKind : u16 {
	TargetOs_Invalid,

	TargetOs_windows,
	TargetOs_darwin,
	TargetOs_linux,
	TargetOs_essence,
	TargetOs_freebsd,
	TargetOs_openbsd,
	TargetOs_netbsd,
	TargetOs_haiku,
	
	TargetOs_wasi,
	TargetOs_js,
	TargetOs_orca,

	TargetOs_freestanding,

	TargetOs_COUNT,
};

gb_global String target_os_names[TargetOs_COUNT] = {
	str_lit(""),
	str_lit("windows"),
	str_lit("darwin"),
	str_lit("linux"),
	str_lit("essence"),
	str_lit("freebsd"),
	str_lit("openbsd"),
	str_lit("netbsd"),
	str_lit("haiku"),

	str_lit("wasi"),
	str_lit("js"),
	str_lit("orca"),

	str_lit("freestanding"),
};

enum TargetArchKind : u16 {
	TargetArch_Invalid,

	TargetArch_amd64,
	TargetArch_i386,
	TargetArch_arm32,
	TargetArch_arm64,
	TargetArch_wasm32,
	TargetArch_wasm64p32,
	TargetArch_riscv64,

	TargetArch_COUNT,
};

gb_global String target_arch_names[TargetArch_COUNT] = {
	str_lit(""),
	str_lit("amd64"),
	str_lit("i386"),
	str_lit("arm32"),
	str_lit("arm64"),
	str_lit("wasm32"),
	str_lit("wasm64p32"),
	str_lit("riscv64"),
};

enum TargetEndianKind : u8 {
	TargetEndian_Little,
	TargetEndian_Big,

	TargetEndian_COUNT,
};

gb_global String target_endian_names[TargetEndian_COUNT] = {
	str_lit("little"),
	str_lit("big"),
};

enum TargetABIKind : u16 {
	TargetABI_Default,

	TargetABI_Win64,
	TargetABI_SysV,

	TargetABI_COUNT,
};

gb_global String target_abi_names[TargetABI_COUNT] = {
	str_lit(""),
	str_lit("win64"),
	str_lit("sysv"),
};

enum Windows_Subsystem : u8 {
	Windows_Subsystem_UNKNOWN,
 	Windows_Subsystem_BOOT_APPLICATION,
	Windows_Subsystem_CONSOLE,                 // Default,
	Windows_Subsystem_EFI_APPLICATION,
	Windows_Subsystem_EFI_BOOT_SERVICE_DRIVER,
	Windows_Subsystem_EFI_ROM,
	Windows_Subsystem_EFI_RUNTIME_DRIVER,
	Windows_Subsystem_NATIVE,
	Windows_Subsystem_POSIX,
	Windows_Subsystem_WINDOWS,
	Windows_Subsystem_WINDOWSCE,
	Windows_Subsystem_COUNT,
};

gb_global String windows_subsystem_names[Windows_Subsystem_COUNT] = {
	str_lit(""),
	str_lit("BOOT_APPLICATION"),
	str_lit("CONSOLE"), // Default
	str_lit("EFI_APPLICATION"),
	str_lit("EFI_BOOT_SERVICE_DRIVER"),
	str_lit("EFI_ROM"),
	str_lit("EFI_RUNTIME_DRIVER"),
	str_lit("NATIVE"),
	str_lit("POSIX"),
	str_lit("WINDOWS"),
	str_lit("WINDOWSCE"),
};

struct MicroarchFeatureList {
	String microarch;
	String features;
};

#if defined(GB_SYSTEM_WINDOWS)
	#include <llvm-c/Config/llvm-config.h>
#else
	#include <llvm/Config/llvm-config.h>
#endif
#include "build_settings_microarch.cpp"

gb_global TargetEndianKind target_endians[TargetArch_COUNT] = {
	TargetEndian_Little,
	TargetEndian_Little,
	TargetEndian_Little,
	TargetEndian_Little,
	TargetEndian_Little,
	TargetEndian_Little,
	TargetEndian_Little,
};

#ifndef ODIN_VERSION_RAW
#define ODIN_VERSION_RAW "dev-unknown-unknown"
#endif

gb_global String const ODIN_VERSION = str_lit(ODIN_VERSION_RAW);

struct TargetMetrics {
	TargetOsKind   os;
	TargetArchKind arch;
	isize          ptr_size;
	isize          int_size;
	isize          max_align;
	isize          max_simd_align;
	String         target_triplet;
	TargetABIKind  abi;
};

enum Subtarget : u32 {
	Subtarget_Default,
	Subtarget_iPhone,
	Subtarget_iPhoneSimulator,
	Subtarget_Android,
	
	Subtarget_COUNT,
	Subtarget_Invalid,    // NOTE(harold): Must appear after _COUNT as this is not a real subtarget
};

gb_global String subtarget_strings[Subtarget_COUNT] = {
	str_lit(""),
	str_lit("iphone"),
	str_lit("iphonesimulator"),
	str_lit("android"),
};


enum QueryDataSetKind {
	QueryDataSet_Invalid,
	QueryDataSet_GlobalDefinitions,
	QueryDataSet_GoToDefinitions,
};

struct QueryDataSetSettings {
	QueryDataSetKind kind;
	bool ok;
	bool compact;
};

enum BuildModeKind {
	BuildMode_Executable,
	BuildMode_DynamicLibrary,
	BuildMode_StaticLibrary,
	BuildMode_Object,
	BuildMode_Assembly,
	BuildMode_LLVM_IR,

	BuildMode_COUNT,
};

enum CommandKind : u64 {
	Command_run             = 1<<0,
	Command_build           = 1<<1,
	Command_check           = 1<<2,
	Command_doc             = 1<<3,
	Command_version         = 1<<4,
	Command_test            = 1<<5,
	
	Command_strip_semicolon = 1<<6,
	Command_bug_report      = 1<<7,

	Command_bundle_android = 1<<8,
	Command_bundle_macos   = 1<<9,
	Command_bundle_ios     = 1<<10,
	Command_bundle_orca    = 1<<11,

	Command__does_check = Command_run|Command_build|Command_check|Command_doc|Command_test|Command_strip_semicolon,
	Command__does_build = Command_run|Command_build|Command_test,
	Command_all = ~(CommandKind)0,
};

gb_global char const *odin_command_strings[32] = {
	"run",
	"build",
	"check",
	"doc",
	"version",
	"test",
	"strip-semicolon",
	"",
	"bundle android",
	"bundle macos",
	"bundle ios",
	"bundle orca",
};



enum CmdDocFlag : u32 {
	CmdDocFlag_Short       = 1<<0,
	CmdDocFlag_AllPackages = 1<<1,
	CmdDocFlag_DocFormat   = 1<<2,
};

enum TimingsExportFormat : i32 {
	TimingsExportUnspecified = 0,
	TimingsExportJson        = 1,
	TimingsExportCSV         = 2,
};

enum DependenciesExportFormat : i32 {
	DependenciesExportUnspecified = 0,
	DependenciesExportMake        = 1,
	DependenciesExportJson        = 2,
};

enum ErrorPosStyle {
	ErrorPosStyle_Default, // path(line:column) msg
	ErrorPosStyle_Unix,    // path:line:column: msg

	ErrorPosStyle_COUNT
};

enum RelocMode : u8 {
	RelocMode_Default,
	RelocMode_Static,
	RelocMode_PIC,
	RelocMode_DynamicNoPIC,
};

enum BuildPath : u8 {
	BuildPath_Main_Package,     // Input  Path to the package directory (or file) we're building.
	BuildPath_RC,               // Input  Path for .rc  file, can be set with `-resource:`.
	BuildPath_RES,              // Output Path for .res file, generated from previous.
	BuildPath_Win_SDK_Bin_Path, // windows_sdk_bin_path
	BuildPath_Win_SDK_UM_Lib,   // windows_sdk_um_library_path
	BuildPath_Win_SDK_UCRT_Lib, // windows_sdk_ucrt_library_path
	BuildPath_VS_EXE,           // vs_exe_path
	BuildPath_VS_LIB,           // vs_library_path

	BuildPath_Output,           // Output Path for .exe, .dll, .so, etc. Can be overridden with `-out:`.
	BuildPath_Symbols,          // Output Path for .pdb or .dSym file, can be overridden with `-pdb-name:`.

	BuildPathCOUNT,
};

enum VetFlags : u64 {
	VetFlag_NONE            = 0,
	VetFlag_Shadowing       = 1u<<0,
	VetFlag_UsingStmt       = 1u<<1,
	VetFlag_UsingParam      = 1u<<2,
	VetFlag_Style           = 1u<<3,
	VetFlag_Semicolon       = 1u<<4,
	VetFlag_UnusedVariables = 1u<<5,
	VetFlag_UnusedImports   = 1u<<6,
	VetFlag_Deprecated      = 1u<<7,
	VetFlag_Cast            = 1u<<8,
	VetFlag_Tabs            = 1u<<9,
	VetFlag_UnusedProcedures = 1u<<10,
	VetFlag_ExplicitAllocators = 1u<<11,

	VetFlag_Unused = VetFlag_UnusedVariables|VetFlag_UnusedImports,

	VetFlag_All = VetFlag_Unused|VetFlag_Shadowing|VetFlag_UsingStmt|VetFlag_Deprecated|VetFlag_Cast,

	VetFlag_Using = VetFlag_UsingStmt|VetFlag_UsingParam,
};

u64 get_vet_flag_from_name(String const &name) {
	if (name == "unused") {
		return VetFlag_Unused;
	} else if (name == "unused-variables") {
		return VetFlag_UnusedVariables;
	} else if (name == "unused-imports") {
		return VetFlag_UnusedImports;
	} else if (name == "shadowing") {
		return VetFlag_Shadowing;
	} else if (name == "using-stmt") {
		return VetFlag_UsingStmt;
	} else if (name == "using-param") {
		return VetFlag_UsingParam;
	} else if (name == "style") {
		return VetFlag_Style;
	} else if (name == "semicolon") {
		return VetFlag_Semicolon;
	} else if (name == "deprecated") {
		return VetFlag_Deprecated;
	} else if (name == "cast") {
		return VetFlag_Cast;
	} else if (name == "tabs") {
		return VetFlag_Tabs;
	} else if (name == "unused-procedures") {
		return VetFlag_UnusedProcedures;
	} else if (name == "explicit-allocators") {
		return VetFlag_ExplicitAllocators;
	}
	return VetFlag_NONE;
}

enum OptInFeatureFlags : u64 {
	OptInFeatureFlag_NONE            = 0,
	OptInFeatureFlag_DynamicLiterals = 1u<<0,

	OptInFeatureFlag_GlobalContext = 1u<<1,

	OptInFeatureFlag_IntegerDivisionByZero_Trap    = 1u<<2,
	OptInFeatureFlag_IntegerDivisionByZero_Zero    = 1u<<3,
	OptInFeatureFlag_IntegerDivisionByZero_Self    = 1u<<4,
	OptInFeatureFlag_IntegerDivisionByZero_AllBits = 1u<<5,


	OptInFeatureFlag_IntegerDivisionByZero_ALL = OptInFeatureFlag_IntegerDivisionByZero_Trap|
	                                             OptInFeatureFlag_IntegerDivisionByZero_Zero|
	                                             OptInFeatureFlag_IntegerDivisionByZero_Self|
	                                             OptInFeatureFlag_IntegerDivisionByZero_AllBits,

};

u64 get_feature_flag_from_name(String const &name) {
	if (name == "dynamic-literals") {
		return OptInFeatureFlag_DynamicLiterals;
	}
	if (name == "integer-division-by-zero:trap") {
		return OptInFeatureFlag_IntegerDivisionByZero_Trap;
	}
	if (name == "integer-division-by-zero:zero") {
		return OptInFeatureFlag_IntegerDivisionByZero_Zero;
	}
	if (name == "integer-division-by-zero:self") {
		return OptInFeatureFlag_IntegerDivisionByZero_Self;
	}
	if (name == "integer-division-by-zero:all-bits") {
		return OptInFeatureFlag_IntegerDivisionByZero_AllBits;
	}


	if (name == "global-context") {
		return OptInFeatureFlag_GlobalContext;
	}
	return OptInFeatureFlag_NONE;
}


enum SanitizerFlags : u32 {
	SanitizerFlag_NONE = 0,
	SanitizerFlag_Address = 1u<<0,
	SanitizerFlag_Memory  = 1u<<1,
	SanitizerFlag_Thread  = 1u<<2,
};

struct BuildCacheData {
	u64 crc;
	String cache_dir;

	// manifests
	String files_path;
	String args_path;
	String env_path;

	bool copy_already_done;
};


enum LinkerChoice : i32 {
	Linker_Invalid = -1,
	Linker_Default = 0,
	Linker_lld,
	Linker_radlink,
	Linker_mold,

	Linker_COUNT,
};

enum SourceCodeLocationInfo : u8 {
	SourceCodeLocationInfo_Normal = 0,
	SourceCodeLocationInfo_Obfuscated = 1,
	SourceCodeLocationInfo_Filename = 2,
	SourceCodeLocationInfo_None = 3,
};

String linker_choices[Linker_COUNT] = {
	str_lit("default"),
	str_lit("lld"),
	str_lit("radlink"),
	str_lit("mold"),
};

enum IntegerDivisionByZeroKind : u8 {
	IntegerDivisionByZero_Trap,
	IntegerDivisionByZero_Zero,
	IntegerDivisionByZero_Self,
	IntegerDivisionByZero_AllBits,
};

// This stores the information for the specify architecture of this build
struct BuildContext {
	// Constants
	String ODIN_OS;                           // Target operating system
	String ODIN_ARCH;                         // Target architecture
	String ODIN_VENDOR;                       // Compiler vendor
	String ODIN_VERSION;                      // Compiler version
	String ODIN_ROOT;                         // Odin ROOT
	String ODIN_BUILD_PROJECT_NAME;           // Odin main/initial package's directory name
	Windows_Subsystem ODIN_WINDOWS_SUBSYSTEM; // .Console, .Windows
	bool   ODIN_DEBUG;                        // Odin in debug mode
	bool   ODIN_DISABLE_ASSERT;               // Whether the default 'assert' et al is disabled in code or not
	bool   ODIN_DEFAULT_TO_NIL_ALLOCATOR;     // Whether the default allocator is a "nil" allocator or not (i.e. it does nothing)
	bool   ODIN_DEFAULT_TO_PANIC_ALLOCATOR;   // Whether the default allocator is a "panic" allocator or not (i.e. panics on any call to it)
	bool   ODIN_FOREIGN_ERROR_PROCEDURES;
	bool   ODIN_VALGRIND_SUPPORT;

	ErrorPosStyle ODIN_ERROR_POS_STYLE;

	TargetEndianKind endian_kind;

	// In bytes
	i64    ptr_size;       // Size of a pointer, must be >= 4
	i64    int_size;       // Size of a int/uint, must be >= 4
	i64    max_align;      // max alignment, must be >= 1 (and typically >= ptr_size)
	i64    max_simd_align; // max alignment, must be >= 1 (and typically >= ptr_size)

	CommandKind command_kind;
	String command;

	TargetMetrics metrics;

	bool show_help;

	Array<Path> build_paths;   // Contains `Path` objects to output filename, pdb, resource and intermediate files.
	                           // BuildPath enum contains the indices of paths we know *before* the work starts.

	String out_filepath;
	String resource_filepath;
	String pdb_filepath;

	u64 vet_flags;
	u32 sanitizer_flags;
	StringSet vet_packages;

	bool   has_resource;
	String link_flags;
	String extra_linker_flags;
	String extra_assembler_flags;
	String microarch;
	BuildModeKind build_mode;
	bool   keep_executable;
	bool   generate_docs;
	bool   custom_optimization_level;
	i32    optimization_level;
	bool   show_timings;
	TimingsExportFormat export_timings_format;
	String export_timings_file;
	DependenciesExportFormat export_dependencies_format;
	String export_dependencies_file;
	bool   show_unused;
	bool   show_unused_with_location;
	bool   show_more_timings;
	bool   show_defineables;
	String export_defineables_file;
	bool   ignore_unused_defineables;
	bool   show_system_calls;
	bool   keep_temp_files;
	bool   ignore_unknown_attributes;
	bool   no_bounds_check;
	bool   no_type_assert;
	bool   dynamic_literals;  // Opt-in to `#+feature dynamic-literals` project-wide.
	bool   no_output_files;
	bool   no_crt;
	bool   no_rpath;
	bool   no_entry_point;
	bool   no_thread_local;
	bool   cross_compiling;
	bool   different_os;
	bool   keep_object_files;
	bool   disallow_do;

	IntegerDivisionByZeroKind integer_division_by_zero_behaviour;

	LinkerChoice linker_choice;

	StringSet custom_attributes;

	bool   strict_style;

	bool   ignore_warnings;
	bool   warnings_as_errors;
	bool   hide_error_line;
	bool   terse_errors;
	bool   json_errors;
	bool   has_ansi_terminal_colours;

	bool   fast_isel;
	bool   ignore_lazy;
	bool   ignore_llvm_build;
	bool   ignore_panic;

	bool   ignore_microsoft_magic;
	bool   linker_map_file;

	bool   build_diagnostics;

	bool   use_single_module;
	bool   use_separate_modules;
	bool   module_per_file;
	bool   cached;
	BuildCacheData build_cache_data;

	bool internal_no_inline;
	bool internal_by_value;
	bool internal_weak_monomorphization;
	bool internal_ignore_llvm_verification;

	bool   no_threaded_checker;

	bool   show_debug_messages;

	bool   copy_file_contents;

	bool   no_rtti;

	bool   dynamic_map_calls;

	SourceCodeLocationInfo source_code_location_info;

	bool   min_link_libs;

	String export_linked_libs_path;

	bool   print_linker_flags;

	RelocMode reloc_mode;
	bool   disable_red_zone;

	isize max_error_count;

	bool tilde_backend;


	u32 cmd_doc_flags;
	Array<String> extra_packages;

	bool      test_all_packages;

	gbAffinity affinity;
	isize      thread_count;

	PtrMap<char const *, ExactValue> defined_values;

	StringSet target_features_set;
	String target_features_string;
	bool strict_target_features;

	String minimum_os_version_string;
	bool   minimum_os_version_string_given;


	int    ODIN_ANDROID_API_LEVEL;

	String ODIN_ANDROID_SDK;

	String ODIN_ANDROID_NDK;
	String ODIN_ANDROID_NDK_TOOLCHAIN;
	String ODIN_ANDROID_NDK_TOOLCHAIN_LIB;
	String ODIN_ANDROID_NDK_TOOLCHAIN_LIB_LEVEL;
	String ODIN_ANDROID_NDK_TOOLCHAIN_SYSROOT;

	String android_keystore;
	String android_keystore_alias;
	String android_keystore_password;
};

gb_global BuildContext build_context = {0};

gb_internal bool IS_ODIN_DEBUG(void) {
	return build_context.ODIN_DEBUG;
}


gb_internal bool global_warnings_as_errors(void) {
	return build_context.warnings_as_errors;
}
gb_internal bool global_ignore_warnings(void) {
	return build_context.ignore_warnings;
}

gb_internal isize MAX_ERROR_COLLECTOR_COUNT(void) {
	if (build_context.max_error_count <= 0) {
		return DEFAULT_MAX_ERROR_COLLECTOR_COUNT;
	}
	return build_context.max_error_count;
}

// NOTE: AMD64 targets had their alignment on 128 bit ints bumped from 8 to 16 (undocumented of course).
#if LLVM_VERSION_MAJOR >= 18
	#define AMD64_MAX_ALIGNMENT 16
#else
	#define AMD64_MAX_ALIGNMENT 8
#endif

#if LLVM_VERSION_MAJOR >= 18
	#define I386_MAX_ALIGNMENT 16
#else
	#define I386_MAX_ALIGNMENT 4
#endif

gb_global TargetMetrics target_windows_i386 = {
	TargetOs_windows,
	TargetArch_i386,
	4, 4, I386_MAX_ALIGNMENT, 16,
	str_lit("i386-pc-windows-msvc"),
};
gb_global TargetMetrics target_windows_amd64 = {
	TargetOs_windows,
	TargetArch_amd64,
	8, 8, AMD64_MAX_ALIGNMENT, 32,
	str_lit("x86_64-pc-windows-msvc"),
};

gb_global TargetMetrics target_linux_i386 = {
	TargetOs_linux,
	TargetArch_i386,
	4, 4, I386_MAX_ALIGNMENT, 16,
	str_lit("i386-pc-linux-gnu"),
};
gb_global TargetMetrics target_linux_amd64 = {
	TargetOs_linux,
	TargetArch_amd64,
	8, 8, AMD64_MAX_ALIGNMENT, 32,
	str_lit("x86_64-pc-linux-gnu"),
};
gb_global TargetMetrics target_linux_arm64 = {
	TargetOs_linux,
	TargetArch_arm64,
	8, 8, 16, 32,
	str_lit("aarch64-linux-elf"),
};
gb_global TargetMetrics target_linux_arm32 = {
	TargetOs_linux,
	TargetArch_arm32,
	4, 4, 8, 16,
	str_lit("arm-unknown-linux-gnueabihf"),
};
gb_global TargetMetrics target_linux_riscv64 = {
	TargetOs_linux,
	TargetArch_riscv64,
	8, 8, 16, 32,
	str_lit("riscv64-linux-gnu"),
};

gb_global TargetMetrics target_darwin_amd64 = {
	TargetOs_darwin,
	TargetArch_amd64,
	8, 8, AMD64_MAX_ALIGNMENT, 32,
	str_lit("x86_64-apple-macosx"), // NOTE: Changes during initialization based on build flags.
};

gb_global TargetMetrics target_darwin_arm64 = {
	TargetOs_darwin,
	TargetArch_arm64,
	8, 8, 16, 32,
	str_lit("arm64-apple-macosx"), // NOTE: Changes during initialization based on build flags.
};

gb_global TargetMetrics target_freebsd_i386 = {
	TargetOs_freebsd,
	TargetArch_i386,
	4, 4, I386_MAX_ALIGNMENT, 16,
	str_lit("i386-unknown-freebsd-elf"),
};

gb_global TargetMetrics target_freebsd_amd64 = {
	TargetOs_freebsd,
	TargetArch_amd64,
	8, 8, AMD64_MAX_ALIGNMENT, 32,
	str_lit("x86_64-unknown-freebsd-elf"),
};

gb_global TargetMetrics target_freebsd_arm64 = {
	TargetOs_freebsd,
	TargetArch_arm64,
	8, 8, 16, 32,
	str_lit("aarch64-unknown-freebsd-elf"),
};

gb_global TargetMetrics target_openbsd_amd64 = {
	TargetOs_openbsd,
	TargetArch_amd64,
	8, 8, AMD64_MAX_ALIGNMENT, 32,
	str_lit("x86_64-unknown-openbsd-elf"),
};

gb_global TargetMetrics target_netbsd_amd64 = {
	TargetOs_netbsd,
	TargetArch_amd64,
	8, 8, AMD64_MAX_ALIGNMENT, 32,
	str_lit("x86_64-unknown-netbsd-elf"),
};

gb_global TargetMetrics target_netbsd_arm64 = {
	TargetOs_netbsd,
	TargetArch_arm64,
	8, 8, 16, 32,
	str_lit("aarch64-unknown-netbsd-elf"),
};

gb_global TargetMetrics target_haiku_amd64 = {
	TargetOs_haiku,
	TargetArch_amd64,
	8, 8, AMD64_MAX_ALIGNMENT, 32,
	str_lit("x86_64-unknown-haiku"),
};

gb_global TargetMetrics target_essence_amd64 = {
	TargetOs_essence,
	TargetArch_amd64,
	8, 8, AMD64_MAX_ALIGNMENT, 32,
	str_lit("x86_64-pc-none-elf"),
};


gb_global TargetMetrics target_freestanding_wasm32 = {
	TargetOs_freestanding,
	TargetArch_wasm32,
	4, 4, 8, 16,
	str_lit("wasm32-freestanding-js"),
};

gb_global TargetMetrics target_js_wasm32 = {
	TargetOs_js,
	TargetArch_wasm32,
	4, 4, 8, 16,
	str_lit("wasm32-js-js"),
};

gb_global TargetMetrics target_wasi_wasm32 = {
	TargetOs_wasi,
	TargetArch_wasm32,
	4, 4, 8, 16,
	str_lit("wasm32-wasi-js"),
};


gb_global TargetMetrics target_orca_wasm32 = {
	TargetOs_orca,
	TargetArch_wasm32,
	4, 4, 8, 16,
	str_lit("wasm32-wasi-js"),
};


gb_global TargetMetrics target_freestanding_wasm64p32 = {
	TargetOs_freestanding,
	TargetArch_wasm64p32,
	4, 8, 8, 16,
	str_lit("wasm32-freestanding-js"),
};

gb_global TargetMetrics target_js_wasm64p32 = {
	TargetOs_js,
	TargetArch_wasm64p32,
	4, 8, 8, 16,
	str_lit("wasm32-js-js"),
};

gb_global TargetMetrics target_wasi_wasm64p32 = {
	TargetOs_wasi,
	TargetArch_wasm32,
	4, 8, 8, 16,
	str_lit("wasm32-wasi-js"),
};



gb_global TargetMetrics target_freestanding_amd64_sysv = {
	TargetOs_freestanding,
	TargetArch_amd64,
	8, 8, AMD64_MAX_ALIGNMENT, 32,
	str_lit("x86_64-pc-none-gnu"),
	TargetABI_SysV,
};

gb_global TargetMetrics target_freestanding_amd64_win64 = {
	TargetOs_freestanding,
	TargetArch_amd64,
	8, 8, AMD64_MAX_ALIGNMENT, 32,
	str_lit("x86_64-pc-none-msvc"),
	TargetABI_Win64,
};

gb_global TargetMetrics target_freestanding_arm64 = {
	TargetOs_freestanding,
	TargetArch_arm64,
	8, 8, 16, 32,
	str_lit("aarch64-none-elf"),
};

gb_global TargetMetrics target_freestanding_arm32 = {
	TargetOs_freestanding,
	TargetArch_arm32,
	4, 4, 8, 16,
	str_lit("arm-unknown-unknown-gnueabihf"),
};
gb_global TargetMetrics target_freestanding_riscv64 = {
	TargetOs_freestanding,
	TargetArch_riscv64,
	8, 8, 16, 32,
	str_lit("riscv64-unknown-gnu"),
};


struct NamedTargetMetrics {
	String name;
	TargetMetrics *metrics;
};

gb_global NamedTargetMetrics named_targets[] = {
	{ str_lit("darwin_amd64"),        &target_darwin_amd64   },
	{ str_lit("darwin_arm64"),        &target_darwin_arm64   },

	{ str_lit("essence_amd64"),       &target_essence_amd64  },

	{ str_lit("linux_i386"),          &target_linux_i386     },
	{ str_lit("linux_amd64"),         &target_linux_amd64    },
	{ str_lit("linux_arm64"),         &target_linux_arm64    },
	{ str_lit("linux_arm32"),         &target_linux_arm32    },
	{ str_lit("linux_riscv64"),       &target_linux_riscv64  },

	{ str_lit("windows_i386"),        &target_windows_i386   },
	{ str_lit("windows_amd64"),       &target_windows_amd64  },

	{ str_lit("freebsd_i386"),        &target_freebsd_i386   },
	{ str_lit("freebsd_amd64"),       &target_freebsd_amd64  },
	{ str_lit("freebsd_arm64"),       &target_freebsd_arm64  },

	{ str_lit("netbsd_amd64"),        &target_netbsd_amd64   },
	{ str_lit("netbsd_arm64"),        &target_netbsd_arm64   },

	{ str_lit("openbsd_amd64"),       &target_openbsd_amd64  },
	{ str_lit("haiku_amd64"),         &target_haiku_amd64    },

	{ str_lit("freestanding_wasm32"), &target_freestanding_wasm32 },
	{ str_lit("wasi_wasm32"),         &target_wasi_wasm32 },
	{ str_lit("js_wasm32"),           &target_js_wasm32 },
	{ str_lit("orca_wasm32"),         &target_orca_wasm32 },

	{ str_lit("freestanding_wasm64p32"), &target_freestanding_wasm64p32 },
	{ str_lit("js_wasm64p32"),           &target_js_wasm64p32 },
	{ str_lit("wasi_wasm64p32"),         &target_wasi_wasm64p32 },

	{ str_lit("freestanding_amd64_sysv"),  &target_freestanding_amd64_sysv },
	{ str_lit("freestanding_amd64_win64"), &target_freestanding_amd64_win64 },

	{ str_lit("freestanding_arm64"), &target_freestanding_arm64 },
	{ str_lit("freestanding_arm32"), &target_freestanding_arm32 },

	{ str_lit("freestanding_riscv64"), &target_freestanding_riscv64 },
};

gb_global NamedTargetMetrics *selected_target_metrics;
gb_global Subtarget selected_subtarget;


gb_internal TargetOsKind get_target_os_from_string(String str, Subtarget *subtarget_ = nullptr, String *subtarget_str = nullptr) {
	String os_name = str;
	String subtarget = {};
	auto part = string_partition(str, str_lit(":"));
	if (part.match.len == 1) {
		os_name = part.head;
		subtarget = part.tail;
	}

	TargetOsKind kind = TargetOs_Invalid;

	for (isize i = 0; i < TargetOs_COUNT; i++) {
		if (str_eq_ignore_case(target_os_names[i], os_name)) {
			kind = cast(TargetOsKind)i;
			break;
		}
	}

	if (subtarget_str) *subtarget_str = subtarget;

	if (subtarget_) {
		if (subtarget.len != 0) {
			*subtarget_ = Subtarget_Invalid;

			if (str_eq_ignore_case(subtarget, "generic") || str_eq_ignore_case(subtarget, "default")) {
				*subtarget_ = Subtarget_Default;
				
			} else {
				for (isize i = 1; i < Subtarget_COUNT; i++) {
					if (str_eq_ignore_case(subtarget_strings[i], subtarget)) {
						*subtarget_ = cast(Subtarget)i;
						break;
					}
				}
			}
		} else {
			*subtarget_ = Subtarget_Default;
		}
	}

	return kind;
}

gb_internal TargetArchKind get_target_arch_from_string(String str) {
	for (isize i = 0; i < TargetArch_COUNT; i++) {
		if (str_eq_ignore_case(target_arch_names[i], str)) {
			return cast(TargetArchKind)i;
		}
	}
	return TargetArch_Invalid;
}

gb_internal bool is_excluded_target_filename(String name) {
	String original_name = name;
	name = remove_extension_from_path(name);

	if (string_starts_with(name, str_lit("."))) {
		// Ignore .*.odin files
		return true;
	}

	String str1 = {};
	String str2 = {};
	isize n = 0;

	str1 = name;
	n = str1.len;
	for (isize i = str1.len-1; i >= 0 && str1[i] != '_'; i--) {
		n -= 1;
	}
	str1 = substring(str1, n, str1.len);

	str2 = substring(name, 0, gb_max(n-1, 0));
	n = str2.len;
	for (isize i = str2.len-1; i >= 0 && str2[i] != '_'; i--) {
		n -= 1;
	}
	str2 = substring(str2, n, str2.len);

	if (str1 == name) {
		return false;
	}

	TargetOsKind   os1   = get_target_os_from_string(str1);
	TargetArchKind arch1 = get_target_arch_from_string(str1);
	TargetOsKind   os2   = get_target_os_from_string(str2);
	TargetArchKind arch2 = get_target_arch_from_string(str2);

	if (os1 != TargetOs_Invalid && arch2 != TargetArch_Invalid) {
		return os1 != build_context.metrics.os || arch2 != build_context.metrics.arch;
	} else if (arch1 != TargetArch_Invalid && os2 != TargetOs_Invalid) {
		return arch1 != build_context.metrics.arch || os2 != build_context.metrics.os;
	} else if (os1 != TargetOs_Invalid) {
		return os1 != build_context.metrics.os;
	} else if (arch1 != TargetArch_Invalid) {
		return arch1 != build_context.metrics.arch;
	}

	return false;
}


struct LibraryCollections {
	String name;
	String path;
};

gb_global Array<LibraryCollections> library_collections = {0};

gb_internal void add_library_collection(String name, String path) {
	LibraryCollections lc = {name, string_trim_whitespace(path)};
	array_add(&library_collections, lc);
}

gb_internal bool find_library_collection_path(String name, String *path) {
	for (auto const &lc : library_collections) {
		if (lc.name == name) {
			if (path) *path = lc.path;
			return true;
		}
	}
	return false;
}

gb_internal bool is_arch_wasm(void) {
	switch (build_context.metrics.arch) {
	case TargetArch_wasm32:
	case TargetArch_wasm64p32:
		return true;
	}
	return false;
}

gb_internal bool is_arch_x86(void) {
	switch (build_context.metrics.arch) {
	case TargetArch_i386:
	case TargetArch_amd64:
		return true;
	}
	return false;
}

// TODO(bill): OS dependent versions for the BuildContext
// join_path
// is_dir
// is_file
// is_abs_path
// has_subdir

gb_global String const WIN32_SEPARATOR_STRING = {cast(u8 *)"\\", 1};
gb_global String const NIX_SEPARATOR_STRING   = {cast(u8 *)"/",  1};

gb_global String const SEPARATOR_STRING =
#if defined(GB_SYSTEM_WINDOWS)
	WIN32_SEPARATOR_STRING;
#else
	NIX_SEPARATOR_STRING;
#endif


gb_global String const WASM_MODULE_NAME_SEPARATOR = str_lit("..");

gb_internal String internal_odin_root_dir(void);

gb_internal String odin_root_dir(void) {
	if (global_module_path_set) {
		return global_module_path;
	}

	gbAllocator a = permanent_allocator();
	char const *found = gb_get_env("ODIN_ROOT", a);
	if (found) {
		String path = path_to_full_path(a, make_string_c(found));
		#if defined(GB_SYSTEM_WINDOWS)
			path = normalize_path(a, path, WIN32_SEPARATOR_STRING);
		#else
			path = normalize_path(a, path, NIX_SEPARATOR_STRING);
		#endif

		global_module_path = path;
		global_module_path_set = true;
		return global_module_path;
	}
	return internal_odin_root_dir();
}


#if defined(GB_SYSTEM_WINDOWS)
gb_internal String internal_odin_root_dir(void) {
	String path = global_module_path;
	isize len, i;
	wchar_t *text;

	if (global_module_path_set) {
		return global_module_path;
	}

	auto path_buf = array_make<wchar_t>(heap_allocator(), 300);

	len = 0;
	for (;;) {
		len = GetModuleFileNameW(nullptr, &path_buf[0], cast(int)path_buf.count);
		if (len == 0) {
			return make_string(nullptr, 0);
		}
		if (len < path_buf.count) {
			break;
		}
		array_resize(&path_buf, 2*path_buf.count + 300);
	}
	len += 1; // NOTE(bill): It needs an extra 1 for some reason

	mutex_lock(&string_buffer_mutex);
	defer (mutex_unlock(&string_buffer_mutex));

	text = permanent_alloc_array<wchar_t>(len+1);

	GetModuleFileNameW(nullptr, text, cast(int)len);
	path = string16_to_string(heap_allocator(), make_string16(cast(u16 *)text, len));

	for (i = path.len-1; i >= 0; i--) {
		u8 c = path[i];
		if (c == '/' || c == '\\') {
			break;
		}
		path.len--;
	}

	global_module_path = path;
	global_module_path_set = true;


	array_free(&path_buf);

	return path;
}

#elif defined(GB_SYSTEM_HAIKU)

#include <FindDirectory.h>

gb_internal String path_to_fullpath(gbAllocator a, String s, bool *ok_);

gb_internal String internal_odin_root_dir(void) {
	String path = global_module_path;
	isize len, i;
	u8 *text;

	if (global_module_path_set) {
		return global_module_path;
	}

	TEMPORARY_ALLOCATOR_GUARD();
	auto path_buf = array_make<char>(temporary_allocator(), 300);

	len = 0;
	for (;;) {
		u32 sz = path_buf.count;
		int res = find_path(B_APP_IMAGE_SYMBOL, B_FIND_PATH_IMAGE_PATH, nullptr, &path_buf[0], sz);
		if(res == B_OK) {
			len = sz;
			break;
		} else {
			array_resize(&path_buf, sz + 1);
		}
	}

	mutex_lock(&string_buffer_mutex);
	defer (mutex_unlock(&string_buffer_mutex));

	text = permanent_alloc_array<u8>(len + 1);
	gb_memmove(text, &path_buf[0], len);

	path = path_to_fullpath(heap_allocator(), make_string(text, len), nullptr);

	for (i = path.len-1; i >= 0; i--) {
		u8 c = path[i];
		if (c == '/' || c == '\\') {
			break;
		}
		path.len--;
	}

	global_module_path = path;
	global_module_path_set = true;

	return path;
}

#elif defined(GB_SYSTEM_OSX)

#include <mach-o/dyld.h>

gb_internal String path_to_fullpath(gbAllocator a, String s, bool *ok_);

gb_internal String internal_odin_root_dir(void) {
	String path = global_module_path;
	isize len, i;
	u8 *text;

	if (global_module_path_set) {
		return global_module_path;
	}

	auto path_buf = array_make<char>(heap_allocator(), 300);
	defer (array_free(&path_buf));

	len = 0;
	for (;;) {
		u32 sz = path_buf.count;
		int res = _NSGetExecutablePath(&path_buf[0], &sz);
		if(res == 0) {
			len = sz;
			break;
		} else {
			array_resize(&path_buf, sz + 1);
		}
	}

	mutex_lock(&string_buffer_mutex);
	defer (mutex_unlock(&string_buffer_mutex));

	text = permanent_alloc_array<u8>(len + 1);
	gb_memmove(text, &path_buf[0], len);

	path = path_to_fullpath(heap_allocator(), make_string(text, len), nullptr);

	for (i = path.len-1; i >= 0; i--) {
		u8 c = path[i];
		if (c == '/' || c == '\\') {
			break;
		}
		path.len--;
	}

	global_module_path = path;
	global_module_path_set = true;

	return path;
}
#else

// NOTE: Linux / Unix is unfinished and not tested very well.
#include <sys/stat.h>

gb_internal String path_to_fullpath(gbAllocator a, String s, bool *ok_);

gb_internal String internal_odin_root_dir(void) {
	String path = global_module_path;
	isize len, i;
	u8 *text;

	if (global_module_path_set) {
		return global_module_path;
	}

	auto path_buf = array_make<char>(heap_allocator(), 300);
	defer (array_free(&path_buf));

	len = 0;
	for (;;) {
		// This is not a 100% reliable system, but for the purposes
		// of this compiler, it should be _good enough_.
		// That said, there's no solid 100% method on Linux to get the program's
		// path without checking this link. Sorry.
#if defined(GB_SYSTEM_FREEBSD)
		int mib[4];
		mib[0] = CTL_KERN;
		mib[1] = KERN_PROC;
		mib[2] = KERN_PROC_PATHNAME;
		mib[3] = -1;
		len = path_buf.count;
		sysctl(mib, 4, &path_buf[0], (size_t *) &len, NULL, 0);
#elif defined(GB_SYSTEM_NETBSD)
		len = readlink("/proc/curproc/exe", &path_buf[0], path_buf.count);
#elif defined(GB_SYSTEM_DRAGONFLYBSD)
		len = readlink("/proc/curproc/file", &path_buf[0], path_buf.count);
#elif defined(GB_SYSTEM_LINUX)
		len = readlink("/proc/self/exe", &path_buf[0], path_buf.count);
#elif defined(GB_SYSTEM_OPENBSD)
		int error;
		int mib[] = {
			CTL_KERN,
			KERN_PROC_ARGS,
			getpid(),
			KERN_PROC_ARGV,
		};
		// get argv size
		error = sysctl(mib, 4, NULL, (size_t *) &len, NULL, 0);
		if (error == -1) {
			// sysctl error
			return make_string(nullptr, 0);
		}
		// get argv
		char **argv = (char **)gb_malloc(len);
		error = sysctl(mib, 4, argv, (size_t *) &len, NULL, 0);
		if (error == -1) {
			// sysctl error
			gb_mfree(argv);
			return make_string(nullptr, 0);
		}

		// NOTE(Jeroen):
		// On OpenBSD, if `odin` is on the path, `argv[0]` will contain just `odin`,
		// even though that isn't then the relative path.
		// When run from Odin's directory, it returns `./odin`.
		// Check argv[0] for lack of / to see if it's a reference to PATH.
		// If so, walk PATH to find the executable.

		len = gb_strlen(argv[0]);

		bool slash_found = false;
		bool odin_found  = false;

		for (int i = 0; i < len; i += 1) {
			if (argv[0][i] == '/') {
				slash_found = true;
				break;
			}
		}

		if (slash_found) {
			// copy argv[0] to path_buf
			if(len < path_buf.count) {
				gb_memmove(&path_buf[0], argv[0], len);
				odin_found = true;
			}
		} else {
			gbAllocator a = heap_allocator();
			char const *path_env = gb_get_env("PATH", a);
			defer (gb_free(a, cast(void *)path_env));

			if (path_env) {
				int path_len = gb_strlen(path_env);
				int path_start = 0;
				int path_end   = 0;

				for (; path_start < path_len; ) {
					for (; path_end <= path_len; path_end++) {
						if (path_env[path_end] == ':' || path_end == path_len) {
							break;
						}
					}
					String path_needle    = (const String)make_string((const u8 *)(path_env + path_start), path_end - path_start);
					String argv0          = (const String)make_string((const u8 *)argv[0], len);
					String odin_candidate = concatenate3_strings(a, path_needle, STR_LIT("/"), argv0);
					defer (gb_free(a, odin_candidate.text));

					if (gb_file_exists((const char *)odin_candidate.text)) {
						len = odin_candidate.len;
						if(len < path_buf.count) {
							gb_memmove(&path_buf[0], odin_candidate.text, len);
						}
						odin_found = true;
						break;
					}

					path_start = path_end + 1;
					path_end   = path_start;
					if (path_start > path_len) {
						break;
					}
				}
			}

			if (!odin_found) {
				gb_printf_err("Odin could not locate itself in PATH, and ODIN_ROOT wasn't set either.\n");
			}
		}
		gb_mfree(argv);
#endif
		if(len == 0 || len == -1) {
			return make_string(nullptr, 0);
		}
		if (len < path_buf.count) {
			break;
		}
		array_resize(&path_buf, 2*path_buf.count + 300);
	}

	mutex_lock(&string_buffer_mutex);
	defer (mutex_unlock(&string_buffer_mutex));

	text = permanent_alloc_array<u8>(len + 1);

	gb_memmove(text, &path_buf[0], len);

	path = path_to_fullpath(heap_allocator(), make_string(text, len), nullptr);
	for (i = path.len-1; i >= 0; i--) {
		u8 c = path[i];
		if (c == '/' || c == '\\') {
			break;
		}
		path.len--;
	}

	global_module_path = path;
	global_module_path_set = true;

	return path;
}
#endif

gb_global BlockingMutex fullpath_mutex;

#if defined(GB_SYSTEM_WINDOWS)
gb_internal String path_to_fullpath(gbAllocator a, String s, bool *ok_) {
	String result = {};

	String16 string16 = string_to_string16(heap_allocator(), s);
	defer (gb_free(heap_allocator(), string16.text));

	DWORD len;

	mutex_lock(&fullpath_mutex);

	len = GetFullPathNameW(cast(wchar_t *)&string16[0], 0, nullptr, nullptr);
	if (len != 0) {
		wchar_t *text = permanent_alloc_array<wchar_t>(len+1);
		GetFullPathNameW(cast(wchar_t *)&string16[0], len, text, nullptr);
		mutex_unlock(&fullpath_mutex);

		text[len] = 0;
		result = string16_to_string(a, make_string16(cast(u16 *)text, len));
		result = string_trim_whitespace(result);

		// Replace Windows style separators
		for (isize i = 0; i < result.len; i++) {
			if (result.text[i] == '\\') {
				result.text[i] = '/';
			}
		}
		if (ok_) *ok_ = true;
	} else {
		if (ok_) *ok_ = false;
		mutex_unlock(&fullpath_mutex);
	}

	return result;
}
#elif defined(GB_SYSTEM_OSX) || defined(GB_SYSTEM_UNIX)

struct PathToFullpathResult {
	String result;
	bool   ok;
};

gb_internal String path_to_fullpath(gbAllocator a, String s, bool *ok_) {
	static gb_thread_local StringMap<PathToFullpathResult> cache;

	PathToFullpathResult *cached = string_map_get(&cache, s);
	if (cached != nullptr) {
		if (ok_) *ok_ = cached->ok;
		return copy_string(a, cached->result);
	}

	char *p;
	p = realpath(cast(char *)s.text, 0);
	defer (free(p));
	if(p == nullptr) {
		if (ok_) *ok_ = false;

		// Path doesn't exist or is malformed, Windows's `GetFullPathNameW` does not check for
		// existence of the file where `realpath` does, which causes different behaviour between platforms.
		// Two things could be done here:
		// 1. clean the path and resolve it manually, just like the Windows function does,
		//    probably requires porting `filepath.clean` from Odin and doing some more processing.
		// 2. just return a copy of the original path.
		//
		// I have opted for 2 because it is much simpler + we already return `ok = false` + further
		// checks and processes will use the path and cause errors (which we want).
		String result = copy_string(a, s);

		PathToFullpathResult cached_result = {};
		cached_result.result = copy_string(permanent_allocator(), result);
		cached_result.ok     = false;
		string_map_set(&cache, copy_string(permanent_allocator(), s), cached_result);

		return result;
	}
	if (ok_) *ok_ = true;
	String result = copy_string(a, make_string_c(p));

	PathToFullpathResult cached_result = {};
	cached_result.result = copy_string(permanent_allocator(), result);
	cached_result.ok     = true;
	string_map_set(&cache, copy_string(permanent_allocator(), s), cached_result);

	return result;
}
#else
#error Implement system
#endif


gb_internal String get_fullpath_relative(gbAllocator a, String base_dir, String path, bool *ok_) {
	u8 *str = gb_alloc_array(heap_allocator(), u8, base_dir.len+1+path.len+1);
	defer (gb_free(heap_allocator(), str));

	isize i = 0;
	gb_memmove(str+i, base_dir.text, base_dir.len); i += base_dir.len;
	gb_memmove(str+i, "/", 1);                      i += 1;
	gb_memmove(str+i, path.text,     path.len);     i += path.len;
	str[i] = 0;

	// IMPORTANT NOTE(bill): Remove trailing path separators
	// this is required to make sure there is a conventional
	// notation for the path
	for (/**/; i > 0; i--) {
		u8 c = str[i-1];
		if (c != '/' && c != '\\') {
			break;
		}
	}

	String res = make_string(str, i);
	res = string_trim_whitespace(res);
	return path_to_fullpath(a, res, ok_);
}


gb_internal String get_fullpath_base_collection(gbAllocator a, String path, bool *ok_) {
	String module_dir = odin_root_dir();

	String base = str_lit("base/");

	isize str_len = module_dir.len + base.len + path.len;
	u8 *str = gb_alloc_array(heap_allocator(), u8, str_len+1);
	defer (gb_free(heap_allocator(), str));

	isize i = 0;
	gb_memmove(str+i, module_dir.text, module_dir.len); i += module_dir.len;
	gb_memmove(str+i, base.text, base.len);             i += base.len;
	gb_memmove(str+i, path.text, path.len);             i += path.len;
	str[i] = 0;

	String res = make_string(str, i);
	res = string_trim_whitespace(res);
	return path_to_fullpath(a, res, ok_);
}

gb_internal String get_fullpath_core_collection(gbAllocator a, String path, bool *ok_) {
	String module_dir = odin_root_dir();

	String core = str_lit("core/");

	isize str_len = module_dir.len + core.len + path.len;
	u8 *str = gb_alloc_array(heap_allocator(), u8, str_len+1);
	defer (gb_free(heap_allocator(), str));

	isize i = 0;
	gb_memmove(str+i, module_dir.text, module_dir.len); i += module_dir.len;
	gb_memmove(str+i, core.text, core.len);             i += core.len;
	gb_memmove(str+i, path.text, path.len);             i += path.len;
	str[i] = 0;

	String res = make_string(str, i);
	res = string_trim_whitespace(res);
	return path_to_fullpath(a, res, ok_);
}

gb_internal bool show_error_line(void) {
	return !build_context.hide_error_line && !build_context.json_errors;
}

gb_internal bool terse_errors(void) {
	return build_context.terse_errors;
}
gb_internal bool json_errors(void) {
	return build_context.json_errors;
}
gb_internal bool has_ansi_terminal_colours(void) {
	return build_context.has_ansi_terminal_colours && !json_errors();
}

gb_internal void init_android_values(bool with_sdk) {
	auto *bc = &build_context;
	{ // Android SDK/API Level
		String default_level = str_lit("34");
		if (!bc->minimum_os_version_string_given) {
			bc->minimum_os_version_string = default_level;
		}
		BigInt level = {};
		bool success = false;
		big_int_from_string(&level, bc->minimum_os_version_string, &success);
		if (!success) {
			gb_printf_err("Warning: Invalid -minimum-os-version:%.*s for -subtarget:Android, defaulting to %.*s\n", LIT(bc->minimum_os_version_string), LIT(default_level));
			bc->minimum_os_version_string = default_level;
			big_int_from_string(&level, bc->minimum_os_version_string, &success);
			GB_ASSERT(success);
		}

		i64 new_level = big_int_to_i64(&level);

		if (new_level >= 21) {
			bc->ODIN_ANDROID_API_LEVEL = cast(int)new_level;
		} else {
			gb_printf_err("Warning: Invalid -minimum-os-version:%.*s for -subtarget:Android, defaulting to %.*s\n", LIT(bc->minimum_os_version_string), LIT(default_level));
			bc->ODIN_ANDROID_API_LEVEL = atoi(cast(char const *)default_level.text);
		}
	}
	bc->ODIN_ANDROID_NDK           = normalize_path(permanent_allocator(), make_string_c(gb_get_env("ODIN_ANDROID_NDK", permanent_allocator())), NIX_SEPARATOR_STRING);
	bc->ODIN_ANDROID_NDK_TOOLCHAIN = normalize_path(permanent_allocator(), make_string_c(gb_get_env("ODIN_ANDROID_NDK_TOOLCHAIN", permanent_allocator())), NIX_SEPARATOR_STRING);
	bc->ODIN_ANDROID_SDK           = normalize_path(permanent_allocator(), make_string_c(gb_get_env("ODIN_ANDROID_SDK", permanent_allocator())), NIX_SEPARATOR_STRING);

	#if defined(GB_SYSTEM_WINDOWS)
		if (bc->ODIN_ANDROID_SDK.len == 0) {
			bc->ODIN_ANDROID_SDK = normalize_path(permanent_allocator(),
				path_to_fullpath(permanent_allocator(), str_lit("%LocalAppData%/Android/Sdk"), nullptr),
				NIX_SEPARATOR_STRING);
		}
	#endif

	if (bc->ODIN_ANDROID_NDK.len != 0 && bc->ODIN_ANDROID_NDK_TOOLCHAIN.len == 0) {
		String arch = str_lit("x86_64");
		#if defined (GB_CPU_ARM)
			// TODO(bill): this is a complete guess
			arch = str_lit("aarch64");
		#endif
		#if defined(GB_SYSTEM_WINDOWS)
			bc->ODIN_ANDROID_NDK_TOOLCHAIN = concatenate4_strings(temporary_allocator(), bc->ODIN_ANDROID_NDK, str_lit("toolchains/llvm/prebuilt/"), str_lit("windows-"), arch);
		#elif defined(GB_SYSTEM_OSX)
			// TODO(bill): is this name even correct?
			bc->ODIN_ANDROID_NDK_TOOLCHAIN = concatenate4_strings(temporary_allocator(), bc->ODIN_ANDROID_NDK, str_lit("toolchains/llvm/prebuilt/"), str_lit("darwin-"), arch);
		#elif defined(GB_SYSTEM_LINUX)
			bc->ODIN_ANDROID_NDK_TOOLCHAIN = concatenate4_strings(temporary_allocator(), bc->ODIN_ANDROID_NDK, str_lit("toolchains/llvm/prebuilt/"), str_lit("linux-"), arch);
		#endif

		bc->ODIN_ANDROID_NDK_TOOLCHAIN = normalize_path(permanent_allocator(), bc->ODIN_ANDROID_NDK_TOOLCHAIN, NIX_SEPARATOR_STRING);
	}

	if (bc->ODIN_ANDROID_NDK.len == 0 && !with_sdk)  {
		gb_printf_err("Error: ODIN_ANDROID_NDK not set");
		gb_exit(1);

	}

	if (bc->ODIN_ANDROID_NDK_TOOLCHAIN.len == 0 && !with_sdk)  {
		gb_printf_err("Error: ODIN_ANDROID_NDK not set");
		gb_exit(1);
	}

	bc->ODIN_ANDROID_NDK_TOOLCHAIN_LIB = concatenate_strings(permanent_allocator(), bc->ODIN_ANDROID_NDK_TOOLCHAIN, str_lit("sysroot/usr/lib/aarch64-linux-android/"));

	char buf[32] = {};
	gb_snprintf(buf, gb_size_of(buf), "%d/", bc->ODIN_ANDROID_API_LEVEL);
	bc->ODIN_ANDROID_NDK_TOOLCHAIN_LIB_LEVEL = concatenate_strings(permanent_allocator(), bc->ODIN_ANDROID_NDK_TOOLCHAIN_LIB, make_string_c(buf));

	bc->ODIN_ANDROID_NDK_TOOLCHAIN_SYSROOT = concatenate_strings(permanent_allocator(), bc->ODIN_ANDROID_NDK_TOOLCHAIN, str_lit("sysroot/"));


	if (with_sdk) {
		if (bc->ODIN_ANDROID_SDK.len == 0)  {
			gb_printf_err("Error: ODIN_ANDROID_SDK not set, which is required for -build-mode:executable for -subtarget:android");
			gb_exit(1);
		}
		if (bc->android_keystore.len == 0) {
			gb_printf_err("Error: -android-keystore:<string> has not been set\n");
			gb_exit(1);
		}
	}
}

gb_internal bool has_asm_extension(String const &path) {
	String ext = path_extension(path);
	if (ext == ".asm") {
		return true;
	} else if (ext == ".s") {
		return true;
	} else if (ext == ".S") {
		return true;
	}
	return false;
}

// temporary
gb_internal char *token_pos_to_string(TokenPos const &pos) {
	gbString s = gb_string_make_reserve(temporary_allocator(), 128);
	String file = get_file_path_string(pos.file_id);
	switch (build_context.ODIN_ERROR_POS_STYLE) {
	default: /*fallthrough*/
	case ErrorPosStyle_Default:
		s = gb_string_append_fmt(s, "%.*s(%d:%d)", LIT(file), pos.line, pos.column);
		break;
	case ErrorPosStyle_Unix:
		s = gb_string_append_fmt(s, "%.*s:%d:%d:", LIT(file), pos.line, pos.column);
		break;
	}
	return s;
}

gb_internal void init_build_context(TargetMetrics *cross_target, Subtarget subtarget) {
	BuildContext *bc = &build_context;

	gb_affinity_init(&bc->affinity);
	if (bc->thread_count == 0) {
		bc->thread_count = gb_max(bc->affinity.thread_count, 1);
	}

	bc->ODIN_VENDOR  = str_lit("odin");
	bc->ODIN_VERSION = ODIN_VERSION;
	bc->ODIN_ROOT    = odin_root_dir();

	if (bc->max_error_count <= 0) {
		bc->max_error_count = DEFAULT_MAX_ERROR_COLLECTOR_COUNT;
	}

	{
		char const *found = gb_get_env("ODIN_ERROR_POS_STYLE", permanent_allocator());
		if (found) {
			ErrorPosStyle kind = ErrorPosStyle_Default;
			String style = make_string_c(found);
			style = string_trim_whitespace(style);
			if (style == "" || style == "default" || style == "odin") {
				kind = ErrorPosStyle_Default;
			} else if (style == "unix" || style == "gcc" || style == "clang" || style == "llvm") {
				kind = ErrorPosStyle_Unix;
			} else {
				gb_printf_err("Invalid ODIN_ERROR_POS_STYLE: got %.*s\n", LIT(style));
				gb_printf_err("Valid formats:\n");
				gb_printf_err("\t\"default\" or \"odin\"\n");
				gb_printf_err("\t\tpath(line:column) message\n");
				gb_printf_err("\t\"unix\"\n");
				gb_printf_err("\t\tpath:line:column: message\n");
				gb_exit(1);
			}

			build_context.ODIN_ERROR_POS_STYLE = kind;
		}
	}

	bc->copy_file_contents = true;

	TargetMetrics *metrics = nullptr;

	#if defined(GB_ARCH_64_BIT)
		#if defined(GB_SYSTEM_WINDOWS)
			metrics = &target_windows_amd64;
		#elif defined(GB_SYSTEM_OSX)
			#if defined(GB_CPU_ARM)
				metrics = &target_darwin_arm64;
			#else
				metrics = &target_darwin_amd64;
			#endif
		#elif defined(GB_SYSTEM_FREEBSD)
			#if defined(GB_CPU_ARM)
				metrics = &target_freebsd_arm64;
			#else
				metrics = &target_freebsd_amd64;
			#endif
		#elif defined(GB_SYSTEM_OPENBSD)
			metrics = &target_openbsd_amd64;
		#elif defined(GB_SYSTEM_NETBSD)
			#if defined(GB_CPU_ARM)
				metrics = &target_netbsd_arm64;
			#else
				metrics = &target_netbsd_amd64;
			#endif
		#elif defined(GB_SYSTEM_HAIKU)
			metrics = &target_haiku_amd64;
		#elif defined(GB_CPU_ARM)
			metrics = &target_linux_arm64;
		#elif defined(GB_CPU_RISCV)
			metrics = &target_linux_riscv64;
		#else
			metrics = &target_linux_amd64;
		#endif
	#elif defined(GB_CPU_ARM)
		#if defined(GB_SYSTEM_WINDOWS)
			#error "Build Error: Unsupported architecture"
		#elif defined(GB_SYSTEM_OSX)
			#error "Build Error: Unsupported architecture"
		#elif defined(GB_SYSTEM_FREEBSD)
			#error "Build Error: Unsupported architecture"
		#else
			metrics = &target_linux_arm32;
		#endif
	#else
		#if defined(GB_SYSTEM_WINDOWS)
			metrics = &target_windows_i386;
		#elif defined(GB_SYSTEM_OSX)
			#error "Build Error: Unsupported architecture"
		#elif defined(GB_SYSTEM_FREEBSD)
			metrics = &target_freebsd_i386;
		#else
			metrics = &target_linux_i386;
		#endif
	#endif

	if (cross_target != nullptr && metrics != cross_target) {
		bc->different_os = cross_target->os != metrics->os;
		bc->cross_compiling = true;
		metrics = cross_target;
	}

	GB_ASSERT(metrics->os != TargetOs_Invalid);
	GB_ASSERT(metrics->arch != TargetArch_Invalid);
	GB_ASSERT(metrics->ptr_size > 1);
	GB_ASSERT(metrics->int_size  > 1);
	GB_ASSERT(metrics->max_align > 1);
	GB_ASSERT(metrics->max_simd_align > 1);

	GB_ASSERT(metrics->int_size >= metrics->ptr_size);
	if (metrics->int_size > metrics->ptr_size) {
		GB_ASSERT(metrics->int_size == 2*metrics->ptr_size);
	}

	bc->metrics = *metrics;

	bc->ODIN_OS           = target_os_names[metrics->os];
	bc->ODIN_ARCH         = target_arch_names[metrics->arch];
	bc->endian_kind       = target_endians[metrics->arch];
	bc->ptr_size          = metrics->ptr_size;
	bc->int_size          = metrics->int_size;
	bc->max_align         = metrics->max_align;
	bc->max_simd_align    = metrics->max_simd_align;
	bc->link_flags        = str_lit(" ");

	#if defined(DEFAULT_TO_THREADED_CHECKER)
	bc->threaded_checker = true;
	#endif

	if (bc->disable_red_zone) {
		if (is_arch_wasm() && bc->metrics.os == TargetOs_freestanding) {
			gb_printf_err("-disable-red-zone is not support for this target");
			gb_exit(1);
		}
	}

	if (bc->metrics.os == TargetOs_freestanding) {
		bc->no_entry_point = true;
	} else {
		if (bc->no_rtti) {
			gb_printf_err("-no-rtti is only allowed on freestanding targets\n");
			gb_exit(1);
		}
	}

	// Default to subsystem:CONSOLE on Windows targets
	if (bc->ODIN_WINDOWS_SUBSYSTEM == Windows_Subsystem_UNKNOWN && bc->metrics.os == TargetOs_windows) {
		bc->ODIN_WINDOWS_SUBSYSTEM = Windows_Subsystem_CONSOLE;
	}

	if (subtarget == Subtarget_Android) {
		switch (build_context.build_mode) {
		case BuildMode_DynamicLibrary:
		case BuildMode_Object:
		case BuildMode_Assembly:
		case BuildMode_LLVM_IR:
			break;
		default:
		case BuildMode_Executable:
		case BuildMode_StaticLibrary:
			if ((build_context.command_kind & Command__does_build) != 0) {
				gb_printf_err("Unsupported -build-mode for -subtarget:android\n");
				gb_printf_err("\tCurrently only supporting: \n");
				// gb_printf_err("\t\texe\n");
				gb_printf_err("\t\tshared\n");
				gb_printf_err("\t\tobject\n");
				gb_printf_err("\t\tassembly\n");
				gb_printf_err("\t\tllvm-ir\n");
				gb_exit(1);
			}
			break;
		}
	}

	if (metrics->os == TargetOs_darwin) {
		switch (subtarget) {
			case Subtarget_iPhone:
				switch (metrics->arch) {
				case TargetArch_arm64:
					bc->metrics.target_triplet = str_lit("arm64-apple-ios");
					break;
				default:
					GB_PANIC("Unknown architecture for -subtarget:iphone");
				}
				break;
			case Subtarget_iPhoneSimulator:
				switch (metrics->arch) {
				case TargetArch_arm64:
					bc->metrics.target_triplet = str_lit("arm64-apple-ios-simulator");
					break;
				case TargetArch_amd64:
					bc->metrics.target_triplet = str_lit("x86_64-apple-ios-simulator");
					break;
				default:
					GB_PANIC("Unknown architecture for -subtarget:iphonesimulator");
				}
				break;
		}
	} else if (metrics->os == TargetOs_linux && subtarget == Subtarget_Android) {
		switch (metrics->arch) {
		case TargetArch_arm64:
			bc->metrics.target_triplet = str_lit("aarch64-none-linux-android");
			bc->reloc_mode = RelocMode_PIC;
			break;
		default:
			GB_PANIC("Unknown architecture for -subtarget:android");
		}
	}

	if (bc->metrics.os == TargetOs_windows) {
		switch (bc->metrics.arch) {
		case TargetArch_amd64:
			bc->link_flags = str_lit("/machine:x64 ");
			break;
		case TargetArch_i386:
			bc->link_flags = str_lit("/machine:x86 ");
			break;
		}
	} else if (bc->metrics.os == TargetOs_darwin) {
		bc->link_flags = concatenate3_strings(permanent_allocator(),
			str_lit("-target "), bc->metrics.target_triplet, str_lit(" "));
	} else if (is_arch_wasm()) {
		gbString link_flags = gb_string_make(heap_allocator(), " ");

		// NOTE(laytan): Put the stack first in the memory,
		// causing a stack overflow to error immediately instead of corrupting globals.
		link_flags = gb_string_appendc(link_flags, "--stack-first ");
		// NOTE(laytan): default stack size is 64KiB, up to a more reasonable 1MiB.
		link_flags = gb_string_appendc(link_flags, "-z stack-size=1048576 ");

		// link_flags = gb_string_appendc(link_flags, "--export-all ");
		// link_flags = gb_string_appendc(link_flags, "--export-table ");
		// if (bc->metrics.arch == TargetArch_wasm64) {
		// 	link_flags = gb_string_appendc(link_flags, "-mwasm64 ");
		// }
		if (bc->metrics.os != TargetOs_orca) {
			link_flags = gb_string_appendc(link_flags, "--allow-undefined ");
		}
		if (bc->no_entry_point || bc->metrics.os == TargetOs_orca) {
			link_flags = gb_string_appendc(link_flags, "--no-entry ");
		}

		bc->link_flags = make_string_c(link_flags);

		// Disallow on wasm
		bc->use_separate_modules = false;
	} if(bc->metrics.arch == TargetArch_riscv64 && bc->cross_compiling) {
		bc->link_flags = str_lit("-target riscv64 ");
	} else {
		// NOTE: for targets other than darwin, we don't specify a `-target` link flag.
		// This is because we don't support cross-linking and clang is better at figuring
		// out what the actual target for linking is,
		// for example, on x86/alpine/musl it HAS to be `x86_64-alpine-linux-musl` to link correctly.
		//
		// Note that codegen will still target the triplet we specify, but the intricate details of
		// a target shouldn't matter as much to codegen (if it does at all) as it does to linking.
	}

	// NOTE: needs to be done after adding the -target flag to the linker flags so the linker
	// does not annoy the user with version warnings.
	if (metrics->os == TargetOs_darwin) {
		if (!bc->minimum_os_version_string_given) {
			if (subtarget == Subtarget_Default) {
				bc->minimum_os_version_string = str_lit("11.0.0");
			} else if (subtarget == Subtarget_iPhone || subtarget == Subtarget_iPhoneSimulator) {
				// NOTE(harold): We default to 17.4 on iOS because that's when os_sync_wait_on_address was added and
				//               we'd like to avoid any potential App Store issues by using the private ulock_* there.
				bc->minimum_os_version_string = str_lit("17.4");
			}
		}

		if (subtarget == Subtarget_iPhoneSimulator) {
			// For the iPhoneSimulator subtarget, the version must be between 'ios' and '-simulator'.
			String suffix = str_lit("-simulator");
			GB_ASSERT(string_ends_with(bc->metrics.target_triplet, suffix));

			String prefix = substring(bc->metrics.target_triplet, 0, bc->metrics.target_triplet.len - suffix.len);
			bc->metrics.target_triplet = concatenate3_strings(permanent_allocator(), prefix, bc->minimum_os_version_string, suffix);
		} else {
			bc->metrics.target_triplet = concatenate_strings(permanent_allocator(), bc->metrics.target_triplet, bc->minimum_os_version_string);
		}
	} else if (selected_subtarget == Subtarget_Android) {
		init_android_values(bc->build_mode == BuildMode_Executable && (bc->command_kind & Command__does_build) != 0);
	}

	if (!bc->custom_optimization_level) {
		// NOTE(bill): when building with `-debug` but not specifying an optimization level
		// default to `-o:none` to improve the debug symbol generation by default
		if (bc->ODIN_DEBUG) {
			bc->optimization_level = -1; // -o:none
		} else {
			bc->optimization_level = 0; // -o:minimal
		}
	}

	bc->optimization_level = gb_clamp(bc->optimization_level, -1, 3);

	if (bc->optimization_level <= 0) {
		if (!is_arch_wasm()) {
			bc->use_separate_modules = true;
		}
	}

	if (build_context.use_single_module) {
		bc->use_separate_modules = false;
	}


	bc->ODIN_VALGRIND_SUPPORT = false;
	if (build_context.metrics.os != TargetOs_windows) {
		switch (bc->metrics.arch) {
		case TargetArch_amd64:
			bc->ODIN_VALGRIND_SUPPORT = true;
			break;
		}
	}

	if (bc->metrics.os == TargetOs_freestanding) {
		bc->ODIN_DEFAULT_TO_NIL_ALLOCATOR = !bc->ODIN_DEFAULT_TO_PANIC_ALLOCATOR;
	}
}

#if defined(GB_SYSTEM_WINDOWS)
// NOTE(IC): In order to find Visual C++ paths without relying on environment variables.
// NOTE(Jeroen): No longer needed in `main.cpp -> linker_stage`. We now resolve those paths in `init_build_paths`.
#include "microsoft_craziness.h"
#endif

// NOTE: the target feature and microarch lists are all sorted, so if it turns out to be slow (I don't think it will)
// a binary search is possible.

gb_internal bool check_single_target_feature_is_valid(String const &feature_list, String const &feature) {
	String_Iterator it = {feature_list, 0};
	for (;;) {
		String str = string_split_iterator(&it, ',');
		if (str == "") break;
		if (str == feature) {
			return true;
		}
	}

	return false;
}

gb_internal bool check_target_feature_is_valid(String const &feature, TargetArchKind arch, String *invalid) {
	String feature_list = target_features_list[arch];
	String_Iterator it = {feature, 0};
	for (;;) {
		String str = string_split_iterator(&it, ',');
		if (str == "") break;
		if (!check_single_target_feature_is_valid(feature_list, str)) {
			if (invalid) *invalid = str;
			return false;
		}
	}

	return true;
}

gb_internal bool check_target_feature_is_valid_globally(String const &feature, String *invalid) {
	String_Iterator it = {feature, 0};
	for (;;) {
		String str = string_split_iterator(&it, ',');
		if (str == "") break;

		bool valid = false;
		for (int arch = TargetArch_Invalid; arch < TargetArch_COUNT; arch += 1) {
			if (check_target_feature_is_valid(str, cast(TargetArchKind)arch, invalid)) {
				valid = true;
				break;
			}
		}

		if (!valid) {
			if (invalid) *invalid = str;
			return false;
		}
	}

	return true;
}

gb_internal bool check_target_feature_is_valid_for_target_arch(String const &feature, String *invalid) {
	return check_target_feature_is_valid(feature, build_context.metrics.arch, invalid);
}

gb_internal bool check_target_feature_is_enabled(String const &feature, String *not_enabled) {
	String_Iterator it = {feature, 0};
	for (;;) {
		String str = string_split_iterator(&it, ',');
		if (str == "") break;

		if (!string_set_exists(&build_context.target_features_set, str)) {
			String plus_str = concatenate_strings(temporary_allocator(), make_string_c("+"), str);

			if (!string_set_exists(&build_context.target_features_set, plus_str)) {
				if (not_enabled) *not_enabled = str;
				return false;
			}
		}

		String minus_str = concatenate_strings(temporary_allocator(), make_string_c("-"), str);

		if (string_set_exists(&build_context.target_features_set, minus_str)) {
			if (not_enabled) *not_enabled = str;
			return false;
		}
	}

	return true;
}

gb_internal bool check_target_feature_is_superset_of(String const &superset, String const &of, String *missing) {
	String_Iterator it = {of, 0};
	for (;;) {
		String str = string_split_iterator(&it, ',');
		if (str == "") break;
		if (!check_single_target_feature_is_valid(superset, str)) {
			if (missing) *missing = str;
			return false;
		}
	}
	return true;
}

gb_internal String infer_object_extension_from_build_context() {
	String output_extension = {};
	if (is_arch_wasm()) {
		output_extension = STR_LIT("wasm.o");
	} else {
		switch (build_context.metrics.os) {
		case TargetOs_windows:
			output_extension = STR_LIT("obj");
			break;
		default:
		case TargetOs_darwin:
		case TargetOs_linux:
		case TargetOs_essence:
			output_extension = STR_LIT("o");
			break;

		case TargetOs_freestanding:
			switch (build_context.metrics.abi) {
			default:
			case TargetABI_Default:
			case TargetABI_SysV:
				output_extension = STR_LIT("o");
				break;
			case TargetABI_Win64:
				output_extension = STR_LIT("obj");
				break;
			}
			break;
		}
	}
	return output_extension;
}

// NOTE(Jeroen): Set/create the output and other paths and report an error as appropriate.
// We've previously called `parse_build_flags`, so `out_filepath` should be set.
gb_internal bool init_build_paths(String init_filename) {
	gbAllocator   ha = heap_allocator();
	BuildContext *bc = &build_context;

	// NOTE(Jeroen): We're pre-allocating BuildPathCOUNT slots so that certain paths are always at the same enumerated index.
	array_init(&bc->build_paths, permanent_allocator(), BuildPathCOUNT);

	string_set_init(&bc->target_features_set, 1024);

	// [BuildPathMainPackage] Turn given init path into a `Path`, which includes normalizing it into a full path.
	bc->build_paths[BuildPath_Main_Package] = path_from_string(ha, init_filename);

	{
		String build_project_name  = last_path_element(bc->build_paths[BuildPath_Main_Package].basename);
		GB_ASSERT(build_project_name.len > 0);
		bc->ODIN_BUILD_PROJECT_NAME = build_project_name;
	}

	bool produces_output_file = false;
	if (bc->command_kind == Command_doc && bc->cmd_doc_flags & CmdDocFlag_DocFormat) {
		produces_output_file = true;
	} else if (bc->command_kind & Command__does_build) {
		produces_output_file = true;
	}

	if (!produces_output_file) {
		// Command doesn't produce output files. We're done.
		return true;
	}

	#if defined(GB_SYSTEM_WINDOWS)
	if (bc->metrics.os == TargetOs_windows) {
		if (bc->resource_filepath.len > 0) {
			bc->build_paths[BuildPath_RES] = path_from_string(ha, bc->resource_filepath);
			if (!string_ends_with(bc->resource_filepath, str_lit(".res"))) {
				bc->build_paths[BuildPath_RES].ext = copy_string(ha, STR_LIT("res"));
				bc->build_paths[BuildPath_RC]      = path_from_string(ha, bc->resource_filepath);
				bc->build_paths[BuildPath_RC].ext  = copy_string(ha, STR_LIT("rc"));
			}
		}

		if ((bc->command_kind & Command__does_build) && (!bc->ignore_microsoft_magic)) {
			// NOTE(ic): It would be nice to extend this so that we could specify the Visual Studio version that we want instead of defaulting to the latest.
			Find_Result find_result = find_visual_studio_and_windows_sdk();

			if (find_result.windows_sdk_version == 0) {
				gb_printf_err("Windows SDK not found.\n");
				return false;
			}

			if (build_context.linker_choice == Linker_Default && find_result.vs_exe_path.len == 0) {
				gb_printf_err("link.exe not found.\n");
				return false;
			}

			if (find_result.vs_library_path.len == 0) {
				gb_printf_err("VS library path not found.\n");
				return false;
			}

			if (find_result.windows_sdk_um_library_path.len > 0) {
				GB_ASSERT(find_result.windows_sdk_ucrt_library_path.len > 0);

				if (find_result.windows_sdk_bin_path.len > 0) {
					bc->build_paths[BuildPath_Win_SDK_Bin_Path]  = path_from_string(ha, find_result.windows_sdk_bin_path);
				}

				if (find_result.windows_sdk_um_library_path.len > 0) {
					bc->build_paths[BuildPath_Win_SDK_UM_Lib]   = path_from_string(ha, find_result.windows_sdk_um_library_path);
				}

				if (find_result.windows_sdk_ucrt_library_path.len > 0) {
					bc->build_paths[BuildPath_Win_SDK_UCRT_Lib] = path_from_string(ha, find_result.windows_sdk_ucrt_library_path);
				}

				if (find_result.vs_exe_path.len > 0) {
					bc->build_paths[BuildPath_VS_EXE]           = path_from_string(ha, find_result.vs_exe_path);
				}

				if (find_result.vs_library_path.len > 0) {
					bc->build_paths[BuildPath_VS_LIB]           = path_from_string(ha, find_result.vs_library_path);
				}
			}
		}
	}
	#endif

	// All the build targets and OSes.
	String output_extension;

	if (bc->command_kind == Command_doc && bc->cmd_doc_flags & CmdDocFlag_DocFormat) {
		output_extension = STR_LIT("odin-doc");
	} else if (is_arch_wasm()) {
		output_extension = STR_LIT("wasm");
	} else if (build_context.build_mode == BuildMode_Executable) {
		// By default use no executable extension.
		output_extension = make_string(nullptr, 0);
		String const single_file_extension = str_lit(".odin");

		if (selected_subtarget == Subtarget_Android) {
			// NOTE(bill): It's always shared!
			output_extension = STR_LIT("so");
		} else if (build_context.metrics.os == TargetOs_windows) {
			output_extension = STR_LIT("exe");
		} else if (build_context.cross_compiling && selected_target_metrics->metrics == &target_essence_amd64) {
			// Do nothing: we don't want the .bin extension
			// when cross compiling
		} else if (path_is_directory(last_path_element(bc->build_paths[BuildPath_Main_Package].basename))) {
			// Add .bin extension to avoid collision
			// with package directory name
			output_extension = STR_LIT("bin");
		} else if (string_ends_with(init_filename, single_file_extension) && path_is_directory(remove_extension_from_path(init_filename))) {
			// Add bin extension if compiling single-file package
			// with same output name as a directory
			output_extension = STR_LIT("bin");
		}
	} else if (build_context.build_mode == BuildMode_DynamicLibrary) {
		// By default use a .so shared library extension.
		output_extension = STR_LIT("so");

		if (build_context.metrics.os == TargetOs_windows) {
			output_extension = STR_LIT("dll");
		} else if (build_context.metrics.os == TargetOs_darwin) {
			output_extension = STR_LIT("dylib");
		}
	} else if (build_context.build_mode == BuildMode_StaticLibrary) {
		output_extension = STR_LIT("a");
		if (build_context.metrics.os == TargetOs_windows) {
			output_extension = STR_LIT("lib");
		}
	} else if (build_context.build_mode == BuildMode_Object) {
		output_extension = infer_object_extension_from_build_context();
	} else if (build_context.build_mode == BuildMode_Assembly) {
		// By default use a .S asm extension.
		output_extension = STR_LIT("S");
	} else if (build_context.build_mode == BuildMode_LLVM_IR) {
		output_extension = STR_LIT("ll");
	} else {
		GB_PANIC("Unhandled build mode/target combination.\n");
	}

	if (bc->out_filepath.len > 0) {
		bc->build_paths[BuildPath_Output] = path_from_string(ha, bc->out_filepath);
		if (build_context.metrics.os == TargetOs_windows) {
			String output_file = path_to_string(ha, bc->build_paths[BuildPath_Output]);
			defer (gb_free(ha, output_file.text));
			if (path_is_directory(bc->build_paths[BuildPath_Output])) {
				gb_printf_err("Output path %.*s is a directory.\n", LIT(output_file));
				return false;
			} else if (bc->build_paths[BuildPath_Output].ext.len == 0) {
				gb_printf_err("Output path %.*s must have an appropriate extension.\n", LIT(output_file));
				return false;
			}
		}
	} else {
		Path output_path;

		if (str_eq(init_filename, str_lit("."))) {
			// We must name the output file after the current directory.
			debugf("Output name will be created from current base name %.*s.\n", LIT(bc->build_paths[BuildPath_Main_Package].basename));
			String last_element  = last_path_element(bc->build_paths[BuildPath_Main_Package].basename);

			if (last_element.len == 0) {
				gb_printf_err("The output name is created from the last path element. `%.*s` has none. Use `-out:output_name.ext` to set it.\n", LIT(bc->build_paths[BuildPath_Main_Package].basename));
				return false;
			}
			output_path.basename = copy_string(ha, bc->build_paths[BuildPath_Main_Package].basename);
			output_path.name     = copy_string(ha, last_element);

		} else {
			// Init filename was not 'current path'.
			// Contruct the output name from the path elements as usual.
			String output_name = init_filename;
			// If it ends with a trailing (back)slash, strip it before continuing.
			while (output_name.len > 0 && (output_name[output_name.len-1] == '/' || output_name[output_name.len-1] == '\\')) {
				output_name.len -= 1;
			}
			// Only trim the extension if it's an Odin source file.
			// This lets people build folders with extensions or files beginning with dots.
			if (path_extension(output_name) == ".odin" && !path_is_directory(output_name)) {
				output_name = remove_extension_from_path(output_name);
			}
			output_name = remove_directory_from_path(output_name);
			output_name = copy_string(ha, string_trim_whitespace(output_name));
			// This is `path_from_string` without the extension trimming.
			Path res = {};
			if (output_name.len > 0) {
				String fullpath = path_to_full_path(ha, output_name);
				defer (gb_free(ha, fullpath.text));

				res.basename = directory_from_path(fullpath);
				res.basename = copy_string(ha, res.basename);

				if (path_is_directory(fullpath)) {
					if (res.basename.len > 0 && res.basename.text[res.basename.len - 1] == '/') {
						res.basename.len--;
					}
				} else {
					isize name_start = (res.basename.len > 0) ? res.basename.len + 1 : res.basename.len;
					res.name         = substring(fullpath, name_start, fullpath.len);
					res.name         = copy_string(ha, res.name);
				}
			}
			output_path = res;

			// Note(Dragos): This is a fix for empty filenames
			// Turn the trailing folder into the file name
			if (output_path.name.len == 0) {
				isize len = output_path.basename.len;
				while (len > 1 && output_path.basename[len - 1] != '/') {
					len -= 1;
				}
				// We reached the slash
				String old_basename = output_path.basename;
				output_path.basename.len = len - 1; // Remove the slash
				output_path.name = substring(old_basename, len, old_basename.len);
				output_path.basename = copy_string(ha, output_path.basename);
				output_path.name = copy_string(ha, output_path.name);
				// The old basename is wrong. Delete it
				gb_free(ha, old_basename.text);
				
				
			}

			// Replace extension.
			if (output_path.ext.len > 0) {
				gb_free(ha, output_path.ext.text);
			}
		}
		output_path.ext  = copy_string(ha, output_extension);

		bc->build_paths[BuildPath_Output] = output_path;
	}

	if (build_context.ODIN_DEBUG) {
		if (build_context.metrics.os == TargetOs_windows) {
			if (bc->pdb_filepath.len > 0) {
				bc->build_paths[BuildPath_Symbols] = path_from_string(ha, bc->pdb_filepath);
			} else {
				Path symbol_path;
				symbol_path.basename = copy_string(ha, bc->build_paths[BuildPath_Output].basename);
				symbol_path.name     = copy_string(ha, bc->build_paths[BuildPath_Output].name);
				symbol_path.ext      = copy_string(ha, STR_LIT("pdb"));
				bc->build_paths[BuildPath_Symbols] = symbol_path;
			}
		} else if (build_context.metrics.os == TargetOs_darwin) {
			Path symbol_path;
			symbol_path.basename = copy_string(ha, bc->build_paths[BuildPath_Output].basename);
			symbol_path.name     = copy_string(ha, bc->build_paths[BuildPath_Output].name);
			symbol_path.ext      = copy_string(ha, STR_LIT("dSYM"));
			bc->build_paths[BuildPath_Symbols] = symbol_path;
		}
	}

	// Do we have an extension? We might not if the output filename was supplied.
	if (bc->build_paths[BuildPath_Output].ext.len == 0) {
		if (build_context.metrics.os == TargetOs_windows || is_arch_wasm() || build_context.build_mode != BuildMode_Executable) {
			bc->build_paths[BuildPath_Output].ext = copy_string(ha, output_extension);
		}
	}

	String output_file = path_to_string(ha, bc->build_paths[BuildPath_Output]);
	defer (gb_free(ha, output_file.text));

	// Check if output path is a directory.
	if (path_is_directory(bc->build_paths[BuildPath_Output])) {
		gb_printf_err("Output path %.*s is a directory.\n", LIT(output_file));
		return false;
	}

	// gbFile      output_file_test;
	// const char* output_file_name = (const char*)output_file.text;
	// gbFileError output_test_err = gb_file_open_mode(&output_file_test, gbFileMode_Append | gbFileMode_Rw, output_file_name);

	// if (output_test_err == 0) {
	// 	gb_file_close(&output_file_test);
	// 	gb_file_remove(output_file_name);
	// } else {
	// 	String output_file = path_to_string(ha, bc->build_paths[BuildPath_Output]);
	// 	defer (gb_free(ha, output_file.text));
	// 	gb_printf_err("No write permissions for output path: %.*s\n", LIT(output_file));
	// 	return false;
	// }

	if (build_context.sanitizer_flags & SanitizerFlag_Address) {
		switch (build_context.metrics.os) {
		case TargetOs_windows:
		case TargetOs_linux:
		case TargetOs_darwin:
		case TargetOs_freebsd:
			break;
		default:
			gb_printf_err("-sanitize:address is only supported on Windows, Linux, Darwin, and FreeBSD\n");
			return false;
		}
	}

	if (build_context.sanitizer_flags & SanitizerFlag_Memory) {
		switch (build_context.metrics.os) {
		case TargetOs_linux:
		case TargetOs_freebsd:
			break;
		default:
			gb_printf_err("-sanitize:memory is only supported on Linux and FreeBSD\n");
			return false;
		}
	}

	if (build_context.sanitizer_flags & SanitizerFlag_Thread) {
		switch (build_context.metrics.os) {
		case TargetOs_linux:
		case TargetOs_darwin:
		case TargetOs_freebsd:
			break;
		default:
			gb_printf_err("-sanitize:thread is only supported on Linux, Darwin, and FreeBSD\n");
			return false;
		}
	}

	bool no_crt_checks_failed = false;
	if (build_context.no_crt && !build_context.ODIN_DEFAULT_TO_NIL_ALLOCATOR && !build_context.ODIN_DEFAULT_TO_PANIC_ALLOCATOR) {
		switch (build_context.metrics.os) {
		case TargetOs_linux:
		case TargetOs_darwin:
		case TargetOs_essence:
		case TargetOs_freebsd:
		case TargetOs_openbsd:
		case TargetOs_netbsd:
		case TargetOs_haiku:
			gb_printf_err("-no-crt on Unix systems requires either -default-to-nil-allocator or -default-to-panic-allocator to also be present, because the default allocator requires CRT\n");
			no_crt_checks_failed = true;
		}
	}

	if (build_context.no_crt && !build_context.no_thread_local) {
		switch (build_context.metrics.os) {
		case TargetOs_linux:
		case TargetOs_darwin:
		case TargetOs_essence:
		case TargetOs_freebsd:
		case TargetOs_openbsd:
		case TargetOs_netbsd:
		case TargetOs_haiku:
			gb_printf_err("-no-crt on Unix systems requires the -no-thread-local flag to also be present, because the TLS is inaccessible without CRT\n");
			no_crt_checks_failed = true;
		}
	}

	if (no_crt_checks_failed) {
		return false;
	}

	return true;
}

